* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: Arial, sans-serif;
  background: #fff;
  color: #000;
}

.app {
  width: 100vw;
  min-height: 100vh;
}

.panel {
  padding: 12px;
}

.hidden {
  display: none !important;
}

h1,
h2 {
  margin: 0;
}

.muted {
  margin: 4px 0 0;
  color: #555;
}

.tabs {
  display: flex;
  gap: 8px;
  margin: 12px 0;
}

.tab {
  border: 1px solid #aaa;
  background: #f5f5f5;
  color: #000;
  padding: 6px 10px;
  cursor: pointer;
}

.tab.active {
  background: #e8e8e8;
}

form {
  display: flex;
  gap: 8px;
  width: 100%;
}

input,
button {
  border: 1px solid #aaa;
  font: inherit;
  padding: 6px 8px;
}

input {
  flex: 1;
  min-width: 0;
}

button {
  background: #f2f2f2;
  color: #000;
  cursor: pointer;
}

.ghost {
  background: #fff;
  color: #000;
}

#authPanel {
  max-width: 420px;
  margin: 40px auto;
  border: 1px solid #ddd;
}

#chatPanel {
  width: 100vw;
  height: 100vh;
  display: flex;
  flex-direction: column;
  border: 0;
  padding: 8px;
}

.chat-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  border-bottom: 1px solid #ddd;
  padding-bottom: 8px;
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 8px;
}

.messages {
  margin: 8px 0;
  flex: 1;
  border: 1px solid #ddd;
  overflow-y: auto;
  padding: 8px;
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.msg {
  border: 1px solid #ddd;
  padding: 6px 8px;
  background: #fff;
}

.msg-head {
  display: flex;
  justify-content: space-between;
  gap: 8px;
  margin-bottom: 3px;
  color: #555;
  font-size: 13px;
}

.msg.you {
  background: #f8f8f8;
}

.error {
  margin: 6px 0 0;
  min-height: 1em;
  color: #b00020;
}

@media (max-width: 700px) {
  .chat-header {
    flex-direction: column;
    align-items: flex-start;
    gap: 8px;
  }

  form {
    flex-direction: column;
  }

  #authPanel {
    margin: 16px;
    max-width: none;
  }
}